Ra″di‐o‐phone (rā″dĭ‐ō̍‐fōn), n. [Radio- + Gr. φωνή sound.] (Physics) An apparatus for the production of sound by the action of luminous or thermal rays. It is essentially the same as the photophone.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.